/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:27:55,591 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:27:55,594 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:27:55,606 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:27:55,607 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:27:55,608 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:27:55,609 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:27:55,611 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:27:55,613 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:27:55,614 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:27:55,615 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:27:55,616 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:27:55,616 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:27:55,617 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:27:55,619 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:27:55,620 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:27:55,621 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:27:55,622 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:27:55,624 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:27:55,626 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:27:55,628 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:27:55,629 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:27:55,630 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:27:55,631 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:27:55,634 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:27:55,643 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:27:55,644 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:27:55,644 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:27:55,645 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:27:55,660 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:27:55,661 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:27:55,662 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:27:55,662 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:27:55,663 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:27:55,663 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:27:55,663 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:27:55,663 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:27:55,663 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:27:55,664 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:27:55,664 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:27:55,664 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:27:55,664 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:27:55,664 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:27:55,664 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:27:55,665 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:27:55,665 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:27:55,665 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:27:55,665 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:27:55,666 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:27:55,666 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:27:55,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:27:55,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:27:55,666 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:27:55,667 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:27:55,667 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:27:55,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:55,667 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:27:55,667 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:27:55,667 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:27:55,980 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:27:56,004 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:27:56,008 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:27:56,009 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:27:56,012 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:27:56,014 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-20 16:27:56,097 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9df88d3b1/594505723c8d4ae99e1aab889afd9ffd/FLAGce96353ff [2020-07-20 16:27:56,593 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:27:56,594 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-20 16:27:56,601 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9df88d3b1/594505723c8d4ae99e1aab889afd9ffd/FLAGce96353ff [2020-07-20 16:27:56,933 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9df88d3b1/594505723c8d4ae99e1aab889afd9ffd [2020-07-20 16:27:56,943 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:27:56,946 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:27:56,947 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:27:56,947 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:27:56,951 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:27:56,952 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:27:56" (1/1) ... [2020-07-20 16:27:56,955 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66604468 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:56, skipping insertion in model container [2020-07-20 16:27:56,955 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:27:56" (1/1) ... [2020-07-20 16:27:56,964 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:27:56,987 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:27:57,162 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:27:57,167 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:27:57,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:27:57,202 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:27:57,202 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57 WrapperNode [2020-07-20 16:27:57,203 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:27:57,203 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:27:57,204 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:27:57,204 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:27:57,222 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,222 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,228 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,233 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,238 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,239 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... [2020-07-20 16:27:57,241 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:27:57,242 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:27:57,242 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:27:57,242 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:27:57,243 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:27:57,396 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:27:57,396 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:27:57,397 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 16:27:57,397 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-20 16:27:57,397 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:27:57,397 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:27:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:27:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 16:27:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-20 16:27:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:27:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:27:57,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:27:57,635 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:27:57,636 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 16:27:57,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:27:57 BoogieIcfgContainer [2020-07-20 16:27:57,651 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:27:57,652 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:27:57,652 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:27:57,661 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:27:57,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:27:56" (1/3) ... [2020-07-20 16:27:57,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b54f85e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:27:57, skipping insertion in model container [2020-07-20 16:27:57,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:27:57" (2/3) ... [2020-07-20 16:27:57,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b54f85e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:27:57, skipping insertion in model container [2020-07-20 16:27:57,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:27:57" (3/3) ... [2020-07-20 16:27:57,668 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-20 16:27:57,691 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:27:57,701 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:27:57,717 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:27:57,742 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:27:57,743 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:27:57,743 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:27:57,743 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:27:57,743 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:27:57,743 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:27:57,743 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:27:57,744 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:27:57,760 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-20 16:27:57,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 16:27:57,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:27:57,768 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:27:57,768 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:27:57,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:27:57,774 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-20 16:27:57,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:27:57,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976902244] [2020-07-20 16:27:57,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:57,894 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:27:57,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:27:57,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:27:57,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:27:57,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:27:57,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:27:57,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976902244] [2020-07-20 16:27:57,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:27:57,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:27:57,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105233874] [2020-07-20 16:27:58,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:27:58,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:27:58,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:27:58,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:27:58,015 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-20 16:27:58,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:27:58,154 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-20 16:27:58,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:27:58,156 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 16:27:58,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:27:58,168 INFO L225 Difference]: With dead ends: 60 [2020-07-20 16:27:58,168 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:27:58,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:27:58,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:27:58,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 16:27:58,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 16:27:58,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-20 16:27:58,220 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-20 16:27:58,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:27:58,221 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-20 16:27:58,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:27:58,221 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-20 16:27:58,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 16:27:58,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:27:58,223 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:27:58,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:58,428 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:27:58,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:27:58,429 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-20 16:27:58,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:27:58,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656577348] [2020-07-20 16:27:58,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:58,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:27:58,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:27:58,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:27:58,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:27:58,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:27:58,499 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:27:58,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656577348] [2020-07-20 16:27:58,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:27:58,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:27:58,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537544431] [2020-07-20 16:27:58,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:27:58,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:27:58,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:27:58,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:27:58,503 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-20 16:27:58,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:27:58,560 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 16:27:58,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:27:58,561 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 16:27:58,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:27:58,563 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:27:58,563 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:27:58,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:27:58,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:27:58,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 16:27:58,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 16:27:58,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-20 16:27:58,572 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-20 16:27:58,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:27:58,572 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-20 16:27:58,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:27:58,572 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-20 16:27:58,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:27:58,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:27:58,574 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:27:58,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:58,788 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:27:58,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:27:58,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-20 16:27:58,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:27:58,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529286229] [2020-07-20 16:27:58,791 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:58,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:27:58,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:27:58,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:27:58,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:27:58,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:27:58,852 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:27:58,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529286229] [2020-07-20 16:27:58,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:27:58,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:27:58,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692643897] [2020-07-20 16:27:58,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:27:58,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:27:58,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:27:58,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:27:58,855 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-20 16:27:58,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:27:58,924 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-20 16:27:58,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:27:58,925 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-20 16:27:58,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:27:58,927 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:27:58,927 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:27:58,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:27:58,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:27:58,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 16:27:58,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 16:27:58,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-20 16:27:58,935 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-20 16:27:58,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:27:58,936 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-20 16:27:58,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:27:58,936 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-20 16:27:58,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:27:58,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:27:58,938 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:27:59,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:59,152 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:27:59,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:27:59,153 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-20 16:27:59,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:27:59,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765367843] [2020-07-20 16:27:59,153 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:59,227 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:27:59,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:27:59,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:27:59,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:27:59,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:27:59,260 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:27:59,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765367843] [2020-07-20 16:27:59,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:27:59,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:27:59,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245810768] [2020-07-20 16:27:59,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:27:59,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:27:59,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:27:59,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:27:59,263 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-20 16:27:59,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:27:59,303 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 16:27:59,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:27:59,303 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-20 16:27:59,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:27:59,305 INFO L225 Difference]: With dead ends: 40 [2020-07-20 16:27:59,305 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 16:27:59,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:27:59,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 16:27:59,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 16:27:59,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 16:27:59,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-20 16:27:59,313 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-20 16:27:59,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:27:59,314 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-20 16:27:59,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:27:59,314 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-20 16:27:59,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 16:27:59,315 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:27:59,315 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:27:59,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:59,526 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:27:59,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:27:59,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-20 16:27:59,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:27:59,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441890899] [2020-07-20 16:27:59,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:59,570 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:27:59,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:27:59,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:27:59,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:27:59,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:27:59,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:27:59,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:27:59,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441890899] [2020-07-20 16:27:59,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:27:59,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2020-07-20 16:27:59,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778793199] [2020-07-20 16:27:59,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:27:59,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:27:59,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:27:59,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:27:59,705 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-07-20 16:27:59,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:27:59,753 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-20 16:27:59,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:27:59,754 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2020-07-20 16:27:59,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:27:59,755 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:27:59,755 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 16:27:59,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:27:59,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 16:27:59,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 16:27:59,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 16:27:59,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 16:27:59,765 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-20 16:27:59,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:27:59,767 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 16:27:59,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:27:59,769 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 16:27:59,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 16:27:59,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:27:59,775 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:27:59,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:27:59,991 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:27:59,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:27:59,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-20 16:27:59,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:27:59,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488192792] [2020-07-20 16:27:59,993 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:00,017 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:28:00,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:00,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:28:00,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:00,118 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:00,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:00,284 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:00,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488192792] [2020-07-20 16:28:00,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:00,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 16:28:00,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507933760] [2020-07-20 16:28:00,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:28:00,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:00,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:28:00,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:28:00,295 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-07-20 16:28:00,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:00,415 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-07-20 16:28:00,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:28:00,418 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-07-20 16:28:00,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:00,419 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:28:00,419 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 16:28:00,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:28:00,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 16:28:00,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 16:28:00,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:28:00,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-20 16:28:00,426 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-20 16:28:00,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:00,426 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-20 16:28:00,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:28:00,427 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-20 16:28:00,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 16:28:00,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:00,428 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:00,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:00,638 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:00,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:00,639 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-20 16:28:00,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:00,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292908277] [2020-07-20 16:28:00,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:00,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:28:00,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:00,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 16:28:00,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:00,794 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:00,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:00,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292908277] [2020-07-20 16:28:00,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:28:00,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-20 16:28:00,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036645170] [2020-07-20 16:28:00,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 16:28:00,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:00,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 16:28:00,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:28:00,895 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2020-07-20 16:28:01,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:01,019 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-20 16:28:01,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:28:01,022 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-07-20 16:28:01,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:01,023 INFO L225 Difference]: With dead ends: 48 [2020-07-20 16:28:01,023 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:28:01,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:28:01,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:28:01,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 16:28:01,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 16:28:01,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-20 16:28:01,036 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-20 16:28:01,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:01,036 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-20 16:28:01,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 16:28:01,040 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-20 16:28:01,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:28:01,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:01,041 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:01,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:01,257 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:01,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:01,258 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-20 16:28:01,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:01,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005603138] [2020-07-20 16:28:01,260 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:01,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:01,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:01,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:28:01,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:05,471 WARN L860 $PredicateComparison]: unable to prove that (exists ((gcd_test_~a Int)) (and (<= |c_gcd_test_#in~b| (div (+ (* gcd_test_~a (- 1)) |c_gcd_test_#in~a|) 3)) (<= |c_gcd_test_#in~b| gcd_test_~a))) is different from true [2020-07-20 16:28:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:05,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:05,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005603138] [2020-07-20 16:28:05,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:28:05,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 16:28:05,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867464484] [2020-07-20 16:28:05,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:28:05,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:05,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:28:05,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=56, Unknown=2, NotChecked=14, Total=90 [2020-07-20 16:28:05,646 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-20 16:28:13,843 WARN L193 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:28:15,902 WARN L860 $PredicateComparison]: unable to prove that (and (exists ((gcd_test_~a Int)) (and (<= |c_gcd_test_#in~b| (div (+ (* gcd_test_~a (- 1)) |c_gcd_test_#in~a|) 3)) (<= |c_gcd_test_#in~b| gcd_test_~a))) (exists ((gcd_test_~a Int)) (and (<= |c_gcd_test_#in~b| (+ c_gcd_test_~b gcd_test_~a)) (<= |c_gcd_test_#in~b| (div (+ (* gcd_test_~a (- 1)) |c_gcd_test_#in~a|) 3))))) is different from true [2020-07-20 16:28:17,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:17,953 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-07-20 16:28:17,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:28:17,955 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 16:28:17,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:17,957 INFO L225 Difference]: With dead ends: 50 [2020-07-20 16:28:17,958 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:28:17,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=24, Invalid=71, Unknown=3, NotChecked=34, Total=132 [2020-07-20 16:28:17,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:28:17,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:28:17,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:28:17,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-07-20 16:28:17,966 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 27 [2020-07-20 16:28:17,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:17,966 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-07-20 16:28:17,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:28:17,966 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-07-20 16:28:17,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 16:28:17,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:17,967 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:18,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,169 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:18,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:18,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1620221187, now seen corresponding path program 4 times [2020-07-20 16:28:18,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:18,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065006330] [2020-07-20 16:28:18,171 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,202 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:18,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:18,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:28:18,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:18,338 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:28:18,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:20,739 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:28:20,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065006330] [2020-07-20 16:28:20,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:20,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-20 16:28:20,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494803569] [2020-07-20 16:28:20,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:28:20,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:20,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:28:20,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:28:20,742 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand 13 states. [2020-07-20 16:28:21,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:21,063 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2020-07-20 16:28:21,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:28:21,065 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2020-07-20 16:28:21,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:21,066 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:28:21,066 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 16:28:21,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:28:21,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 16:28:21,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 16:28:21,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:28:21,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 16:28:21,073 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 29 [2020-07-20 16:28:21,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:21,073 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 16:28:21,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:28:21,074 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 16:28:21,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 16:28:21,075 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:21,075 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:21,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:21,276 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:21,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:21,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 5 times [2020-07-20 16:28:21,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:21,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548121568] [2020-07-20 16:28:21,278 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:21,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:21,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:21,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:28:21,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:21,635 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:21,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:21,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,867 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 5 [2020-07-20 16:28:25,450 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 16:28:28,370 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 16:28:33,036 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 16:28:40,637 WARN L193 SmtUtils]: Spent 450.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 16:28:44,800 WARN L193 SmtUtils]: Spent 572.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:28:51,793 WARN L193 SmtUtils]: Spent 688.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 16:28:55,388 WARN L193 SmtUtils]: Spent 859.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:28:55,504 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:55,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548121568] [2020-07-20 16:28:55,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:55,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-20 16:28:55,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668175089] [2020-07-20 16:28:55,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:28:55,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:55,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:28:55,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=492, Unknown=9, NotChecked=0, Total=552 [2020-07-20 16:28:55,507 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 24 states. [2020-07-20 16:28:58,095 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 10 [2020-07-20 16:29:27,188 WARN L193 SmtUtils]: Spent 25.28 s on a formula simplification. DAG size of input: 36 DAG size of output: 8 [2020-07-20 16:30:00,197 WARN L193 SmtUtils]: Spent 27.60 s on a formula simplification. DAG size of input: 35 DAG size of output: 10 [2020-07-20 16:30:31,569 WARN L193 SmtUtils]: Spent 23.67 s on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 16:31:21,903 WARN L193 SmtUtils]: Spent 37.83 s on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2020-07-20 16:32:08,015 WARN L193 SmtUtils]: Spent 24.10 s on a formula simplification. DAG size of input: 30 DAG size of output: 15 [2020-07-20 16:32:14,869 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse1 (* 3 |c_gcd_test_#in~b|))) (let ((.cse3 (< .cse1 |c_gcd_test_#in~a|))) (let ((.cse4 (* 3 c_gcd_test_~b)) (.cse0 (* 2 c_gcd_test_~a)) (.cse2 (and (<= (* 2 |c_gcd_test_#in~a|) (* 7 |c_gcd_test_#in~b|)) (not (= 0 (mod |c_gcd_test_#in~a| (+ |c_gcd_test_#in~a| (* |c_gcd_test_#in~b| (- 3)))))) .cse3))) (and (<= .cse0 |c_gcd_test_#in~b|) (= |c_gcd_test_#in~a| (+ c_gcd_test_~a .cse1)) (or (= 0 (mod |c_gcd_test_#in~a| c_gcd_test_~a)) .cse2) .cse3 (<= (+ c_gcd_test_~b c_gcd_test_~a) |c_gcd_test_#in~b|) (or (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (< .cse4 .cse0) (<= c_gcd_test_~a c_gcd_test_~b) .cse2) (or (<= c_gcd_test_~a .cse4) (< (* 7 c_gcd_test_~b) .cse0) (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 3)) c_gcd_test_~a))) .cse2) (or (= (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)) 0) (< (* 5 c_gcd_test_~b) .cse0) (<= c_gcd_test_~a (* 2 c_gcd_test_~b)) .cse2))))) is different from false [2020-07-20 16:33:01,366 WARN L193 SmtUtils]: Spent 25.98 s on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 16:33:04,910 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* 3 c_gcd_test_~b)) (.cse1 (* 2 c_gcd_test_~a)) (.cse2 (and (<= (* 2 |c_gcd_test_#in~a|) (* 7 |c_gcd_test_#in~b|)) (not (= 0 (mod |c_gcd_test_#in~a| (+ |c_gcd_test_#in~a| (* |c_gcd_test_#in~b| (- 3)))))) (< (* 3 |c_gcd_test_#in~b|) |c_gcd_test_#in~a|)))) (and (or (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (< .cse0 .cse1) (<= c_gcd_test_~a c_gcd_test_~b) .cse2) (or (<= c_gcd_test_~a .cse0) (< (* 7 c_gcd_test_~b) .cse1) (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 3)) c_gcd_test_~a))) .cse2) (or (= (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)) 0) (< (* 5 c_gcd_test_~b) .cse1) (<= c_gcd_test_~a (* 2 c_gcd_test_~b)) .cse2))) is different from false [2020-07-20 16:33:11,902 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 16:33:20,714 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 16:33:37,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:33:37,897 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-20 16:33:37,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:33:37,917 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 29 [2020-07-20 16:33:37,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:33:37,918 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:33:37,918 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 16:33:37,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 254.0s TimeCoverageRelationStatistics Valid=107, Invalid=1011, Unknown=12, NotChecked=130, Total=1260 [2020-07-20 16:33:37,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 16:33:37,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 16:33:37,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 16:33:37,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2020-07-20 16:33:37,926 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 29 [2020-07-20 16:33:37,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:33:37,926 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2020-07-20 16:33:37,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:33:37,927 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2020-07-20 16:33:37,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:33:37,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:33:37,928 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:33:38,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:38,133 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:33:38,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:33:38,134 INFO L82 PathProgramCache]: Analyzing trace with hash 841482334, now seen corresponding path program 6 times [2020-07-20 16:33:38,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:33:38,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723013974] [2020-07-20 16:33:38,135 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:38,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:33:38,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:33:38,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:33:38,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:33:41,122 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:33:41,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:33:41,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723013974] [2020-07-20 16:33:41,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:33:41,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 16:33:41,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872511991] [2020-07-20 16:33:41,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:33:41,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:33:41,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:33:41,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=71, Unknown=1, NotChecked=0, Total=90 [2020-07-20 16:33:41,790 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 9 states. [2020-07-20 16:33:53,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:33:53,248 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-20 16:33:53,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:33:53,258 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-07-20 16:33:53,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:33:53,259 INFO L225 Difference]: With dead ends: 54 [2020-07-20 16:33:53,259 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:33:53,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=22, Invalid=86, Unknown=2, NotChecked=0, Total=110 [2020-07-20 16:33:53,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:33:53,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-20 16:33:53,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 16:33:53,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-07-20 16:33:53,266 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 31 [2020-07-20 16:33:53,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:33:53,266 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-07-20 16:33:53,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:33:53,267 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-07-20 16:33:53,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:33:53,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:33:53,268 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:33:53,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:53,473 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:33:53,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:33:53,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1492674782, now seen corresponding path program 7 times [2020-07-20 16:33:53,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:33:53,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007587713] [2020-07-20 16:33:53,475 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:53,516 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:33:53,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:33:53,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 16:33:53,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:33:53,539 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 16:33:53,539 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:33:53,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007587713] [2020-07-20 16:33:53,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:33:53,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 16:33:53,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217327945] [2020-07-20 16:33:53,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 16:33:53,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:33:53,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 16:33:53,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 16:33:53,541 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 3 states. [2020-07-20 16:33:53,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:33:53,569 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-20 16:33:53,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 16:33:53,571 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 16:33:53,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:33:53,572 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:33:53,572 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:33:53,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 16:33:53,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:33:53,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-20 16:33:53,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 16:33:53,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-20 16:33:53,580 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2020-07-20 16:33:53,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:33:53,580 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-20 16:33:53,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 16:33:53,580 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-20 16:33:53,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 16:33:53,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:33:53,581 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:33:53,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:53,783 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:33:53,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:33:53,783 INFO L82 PathProgramCache]: Analyzing trace with hash -202245895, now seen corresponding path program 8 times [2020-07-20 16:33:53,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:33:53,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448358043] [2020-07-20 16:33:53,785 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-20 16:33:53,813 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:33:53,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:53,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:33:53,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:33:57,356 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_110 Int)) (and (<= (div (+ v_gcd_test_~a_110 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|) (<= (+ (* 2 v_gcd_test_~a_110) (div (* v_gcd_test_~a_110 (- 1)) (- 2))) |c_gcd_test_#in~b|))) is different from true [2020-07-20 16:33:57,444 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 7 not checked. [2020-07-20 16:33:57,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:33:58,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448358043] [2020-07-20 16:33:58,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:33:58,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-20 16:33:58,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062138008] [2020-07-20 16:33:58,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:33:58,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:33:58,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:33:58,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=91, Unknown=1, NotChecked=18, Total=132 [2020-07-20 16:33:58,955 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 11 states. [2020-07-20 16:34:01,445 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 16:34:02,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:02,053 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2020-07-20 16:34:02,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:34:02,069 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-07-20 16:34:02,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:02,070 INFO L225 Difference]: With dead ends: 57 [2020-07-20 16:34:02,070 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 16:34:02,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=44, Invalid=169, Unknown=1, NotChecked=26, Total=240 [2020-07-20 16:34:02,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 16:34:02,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-07-20 16:34:02,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 16:34:02,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-07-20 16:34:02,079 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 33 [2020-07-20 16:34:02,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:02,079 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-07-20 16:34:02,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:34:02,080 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-07-20 16:34:02,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-20 16:34:02,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:02,082 INFO L422 BasicCegarLoop]: trace histogram [8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:02,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:02,289 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:02,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:02,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1486576746, now seen corresponding path program 9 times [2020-07-20 16:34:02,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:02,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302438438] [2020-07-20 16:34:02,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:02,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:34:02,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:02,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:34:02,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:11,701 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:34:11,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:34:12,224 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:34:13,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302438438] [2020-07-20 16:34:13,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:34:13,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-20 16:34:13,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135043905] [2020-07-20 16:34:13,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:34:13,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:34:13,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:34:13,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=130, Unknown=2, NotChecked=0, Total=156 [2020-07-20 16:34:13,249 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 12 states. [2020-07-20 16:34:16,795 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2020-07-20 16:34:17,604 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 16:34:24,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:24,484 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2020-07-20 16:34:24,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:34:24,499 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2020-07-20 16:34:24,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:24,500 INFO L225 Difference]: With dead ends: 60 [2020-07-20 16:34:24,500 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:34:24,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=52, Invalid=252, Unknown=2, NotChecked=0, Total=306 [2020-07-20 16:34:24,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:34:24,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 16:34:24,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 16:34:24,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2020-07-20 16:34:24,508 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2020-07-20 16:34:24,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:24,509 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2020-07-20 16:34:24,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:34:24,509 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2020-07-20 16:34:24,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 16:34:24,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:24,510 INFO L422 BasicCegarLoop]: trace histogram [9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:24,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:24,723 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:24,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:24,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1222056691, now seen corresponding path program 10 times [2020-07-20 16:34:24,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:24,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932442960] [2020-07-20 16:34:24,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:24,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:34:24,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:24,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 16:34:24,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:34,183 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_152 Int)) (and (<= (+ (div (* v_gcd_test_~a_152 (- 1)) (- 4)) (* 2 v_gcd_test_~a_152)) |c_gcd_test_#in~b|) (<= (div (+ v_gcd_test_~a_152 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|))) is different from true [2020-07-20 16:34:34,270 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2020-07-20 16:34:34,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:34:36,213 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:36,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932442960] [2020-07-20 16:34:36,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:34:36,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 16:34:36,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501799413] [2020-07-20 16:34:36,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:34:36,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:34:36,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:34:36,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=131, Unknown=3, NotChecked=22, Total=182 [2020-07-20 16:34:36,218 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2020-07-20 16:34:42,069 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2020-07-20 16:34:43,052 WARN L193 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 26 [2020-07-20 16:34:45,880 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 16:34:54,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:54,695 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2020-07-20 16:34:54,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:34:54,716 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2020-07-20 16:34:54,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:54,717 INFO L225 Difference]: With dead ends: 58 [2020-07-20 16:34:54,717 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 16:34:54,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=62, Invalid=281, Unknown=3, NotChecked=34, Total=380 [2020-07-20 16:34:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 16:34:54,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-20 16:34:54,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 16:34:54,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-20 16:34:54,725 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2020-07-20 16:34:54,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:54,725 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-20 16:34:54,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:34:54,726 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-20 16:34:54,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:34:54,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:54,726 INFO L422 BasicCegarLoop]: trace histogram [10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:54,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:54,942 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:54,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:54,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1468608272, now seen corresponding path program 11 times [2020-07-20 16:34:54,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:54,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47048142] [2020-07-20 16:34:54,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:54,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:34:54,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:54,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:34:54,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:55,538 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:34:55,926 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:35:05,401 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:35:05,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:06,147 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:35:06,400 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:35:06,639 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:35:07,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47048142] [2020-07-20 16:35:07,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:35:07,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-20 16:35:07,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86217181] [2020-07-20 16:35:07,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:35:07,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:07,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:35:07,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=180, Unknown=2, NotChecked=0, Total=210 [2020-07-20 16:35:07,882 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 14 states. [2020-07-20 16:35:19,891 WARN L193 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2020-07-20 16:35:21,621 WARN L193 SmtUtils]: Spent 510.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 26 [2020-07-20 16:35:22,884 WARN L193 SmtUtils]: Spent 432.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2020-07-20 16:35:25,931 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 16:35:33,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:33,697 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-07-20 16:35:33,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:35:33,733 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-07-20 16:35:33,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:33,734 INFO L225 Difference]: With dead ends: 62 [2020-07-20 16:35:33,734 INFO L226 Difference]: Without dead ends: 46 [2020-07-20 16:35:33,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=74, Invalid=386, Unknown=2, NotChecked=0, Total=462 [2020-07-20 16:35:33,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-20 16:35:33,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-07-20 16:35:33,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 16:35:33,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2020-07-20 16:35:33,746 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 39 [2020-07-20 16:35:33,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:33,746 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2020-07-20 16:35:33,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:35:33,746 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2020-07-20 16:35:33,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:35:33,747 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:33,747 INFO L422 BasicCegarLoop]: trace histogram [11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:33,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:33,954 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:33,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:33,954 INFO L82 PathProgramCache]: Analyzing trace with hash -2113490963, now seen corresponding path program 12 times [2020-07-20 16:35:33,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:33,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070772880] [2020-07-20 16:35:33,955 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:33,989 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:35:33,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:33,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:35:33,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:34,593 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:35:34,995 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:35:46,418 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:35:46,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:46,527 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:35:46,742 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:35:46,854 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:35:46,981 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:35:47,352 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:35:47,614 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:35:47,847 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:35:48,154 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:35:50,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070772880] [2020-07-20 16:35:50,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:35:50,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 16:35:50,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380687771] [2020-07-20 16:35:50,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:35:50,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:50,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:35:50,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=208, Unknown=2, NotChecked=0, Total=240 [2020-07-20 16:35:50,183 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 15 states. [2020-07-20 16:36:04,842 WARN L193 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 28 [2020-07-20 16:36:08,400 WARN L193 SmtUtils]: Spent 509.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 26 [2020-07-20 16:36:11,915 WARN L193 SmtUtils]: Spent 518.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 27 [2020-07-20 16:36:17,403 WARN L193 SmtUtils]: Spent 455.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 16:36:20,692 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 16:36:31,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:36:31,484 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2020-07-20 16:36:31,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:36:31,503 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2020-07-20 16:36:31,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:36:31,504 INFO L225 Difference]: With dead ends: 64 [2020-07-20 16:36:31,504 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:36:31,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=88, Invalid=461, Unknown=3, NotChecked=0, Total=552 [2020-07-20 16:36:31,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:36:31,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 16:36:31,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 16:36:31,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-20 16:36:31,518 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2020-07-20 16:36:31,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:36:31,518 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-20 16:36:31,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:36:31,518 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-20 16:36:31,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 16:36:31,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:36:31,519 INFO L422 BasicCegarLoop]: trace histogram [12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:36:31,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:31,727 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:36:31,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:36:31,728 INFO L82 PathProgramCache]: Analyzing trace with hash 52915594, now seen corresponding path program 13 times [2020-07-20 16:36:31,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:36:31,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1538486395] [2020-07-20 16:36:31,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:31,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:36:31,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:36:31,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:36:31,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:36:32,430 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:36:32,872 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:36:45,251 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:36:45,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:36:45,368 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:45,496 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:45,635 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:36:45,784 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:36:45,963 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:36:46,106 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:36:46,221 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:36:46,347 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:36:46,469 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:36:46,581 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:36:48,786 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 16:36:48,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1538486395] [2020-07-20 16:36:48,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:36:48,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-20 16:36:48,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584169413] [2020-07-20 16:36:48,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:36:48,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:36:48,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:36:48,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=239, Unknown=1, NotChecked=0, Total=272 [2020-07-20 16:36:48,791 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 16 states. [2020-07-20 16:37:09,043 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 28 [2020-07-20 16:37:12,604 WARN L193 SmtUtils]: Spent 687.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 26 [2020-07-20 16:37:14,845 WARN L193 SmtUtils]: Spent 632.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 27 [2020-07-20 16:37:18,810 WARN L193 SmtUtils]: Spent 637.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 16:37:24,753 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 16:37:31,604 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 16:37:42,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:37:42,354 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2020-07-20 16:37:42,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:37:42,377 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 43 [2020-07-20 16:37:42,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:37:42,378 INFO L225 Difference]: With dead ends: 66 [2020-07-20 16:37:42,378 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:37:42,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 35.2s TimeCoverageRelationStatistics Valid=104, Invalid=541, Unknown=5, NotChecked=0, Total=650 [2020-07-20 16:37:42,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:37:42,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-07-20 16:37:42,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 16:37:42,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-07-20 16:37:42,387 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 43 [2020-07-20 16:37:42,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:37:42,387 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-07-20 16:37:42,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:37:42,387 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-07-20 16:37:42,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 16:37:42,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:37:42,388 INFO L422 BasicCegarLoop]: trace histogram [13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:37:42,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:37:42,603 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:37:42,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:37:42,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1089521689, now seen corresponding path program 14 times [2020-07-20 16:37:42,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:37:42,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258050757] [2020-07-20 16:37:42,605 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:37:42,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:37:42,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:37:42,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 16:37:42,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:37:43,380 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:37:43,860 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:37:54,202 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:38:01,586 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:38:05,986 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 16:38:06,118 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:38:06,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:38:06,314 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:38:06,516 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:38:06,692 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:38:06,865 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:38:07,036 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:38:07,506 WARN L193 SmtUtils]: Spent 466.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:38:07,956 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:38:08,504 WARN L193 SmtUtils]: Spent 544.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:38:09,102 WARN L193 SmtUtils]: Spent 595.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:38:09,644 WARN L193 SmtUtils]: Spent 538.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:38:10,165 WARN L193 SmtUtils]: Spent 518.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:38:14,829 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:38:14,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258050757] [2020-07-20 16:38:14,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:38:14,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-20 16:38:14,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044300692] [2020-07-20 16:38:14,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:38:14,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:38:14,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:38:14,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=267, Unknown=5, NotChecked=0, Total=306 [2020-07-20 16:38:14,833 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 17 states. [2020-07-20 16:38:39,352 WARN L193 SmtUtils]: Spent 694.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 28 [2020-07-20 16:38:41,757 WARN L193 SmtUtils]: Spent 723.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 26 [2020-07-20 16:38:45,775 WARN L193 SmtUtils]: Spent 712.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 27 [2020-07-20 16:38:52,048 WARN L193 SmtUtils]: Spent 647.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-20 16:39:00,581 WARN L193 SmtUtils]: Spent 696.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 16:39:09,027 WARN L193 SmtUtils]: Spent 635.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 16:39:12,970 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 16:39:24,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:39:24,487 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2020-07-20 16:39:24,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:39:24,530 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2020-07-20 16:39:24,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:39:24,530 INFO L225 Difference]: With dead ends: 68 [2020-07-20 16:39:24,531 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 16:39:24,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 50.5s TimeCoverageRelationStatistics Valid=122, Invalid=626, Unknown=8, NotChecked=0, Total=756 [2020-07-20 16:39:24,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 16:39:24,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-07-20 16:39:24,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 16:39:24,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2020-07-20 16:39:24,539 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 45 [2020-07-20 16:39:24,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:39:24,539 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2020-07-20 16:39:24,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:39:24,539 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2020-07-20 16:39:24,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 16:39:24,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:39:24,540 INFO L422 BasicCegarLoop]: trace histogram [14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:39:24,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:24,747 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:39:24,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:39:24,747 INFO L82 PathProgramCache]: Analyzing trace with hash 539877124, now seen corresponding path program 15 times [2020-07-20 16:39:24,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:39:24,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743039469] [2020-07-20 16:39:24,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:24,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:39:24,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:39:24,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:39:24,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:39:25,597 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:39:26,116 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:39:27,267 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:39:37,258 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:39:46,694 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:39:51,874 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 16:39:52,001 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:39:52,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:39:52,199 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:39:52,396 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:39:52,625 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:39:52,848 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:39:53,065 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:39:53,494 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:39:53,893 WARN L193 SmtUtils]: Spent 394.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:39:54,282 WARN L193 SmtUtils]: Spent 386.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:39:54,672 WARN L193 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:39:55,098 WARN L193 SmtUtils]: Spent 422.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:39:55,486 WARN L193 SmtUtils]: Spent 384.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:39:55,853 WARN L193 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:39:58,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743039469] [2020-07-20 16:39:58,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:39:58,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-20 16:39:58,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44016310] [2020-07-20 16:39:58,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:39:58,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:39:58,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:39:58,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=303, Unknown=3, NotChecked=0, Total=342 [2020-07-20 16:39:58,358 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 18 states. [2020-07-20 16:40:10,492 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-20 16:40:18,400 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-20 16:40:25,304 WARN L193 SmtUtils]: Spent 565.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 28 [2020-07-20 16:40:28,028 WARN L193 SmtUtils]: Spent 784.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 26 [2020-07-20 16:40:30,336 WARN L193 SmtUtils]: Spent 725.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 27 [2020-07-20 16:40:34,929 WARN L193 SmtUtils]: Spent 754.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-20 16:40:41,521 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-20 16:40:49,268 WARN L193 SmtUtils]: Spent 674.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 16:40:56,412 WARN L193 SmtUtils]: Spent 591.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 16:41:00,911 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 16:41:09,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:41:09,134 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2020-07-20 16:41:09,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 16:41:09,166 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 47 [2020-07-20 16:41:09,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:41:09,167 INFO L225 Difference]: With dead ends: 70 [2020-07-20 16:41:09,167 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 16:41:09,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 54.9s TimeCoverageRelationStatistics Valid=142, Invalid=723, Unknown=5, NotChecked=0, Total=870 [2020-07-20 16:41:09,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 16:41:09,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-20 16:41:09,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 16:41:09,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2020-07-20 16:41:09,174 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 47 [2020-07-20 16:41:09,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:41:09,174 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2020-07-20 16:41:09,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:41:09,175 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2020-07-20 16:41:09,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 16:41:09,175 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:41:09,175 INFO L422 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:41:09,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:41:09,376 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:41:09,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:41:09,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1270926623, now seen corresponding path program 16 times [2020-07-20 16:41:09,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:41:09,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380820672] [2020-07-20 16:41:09,378 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:41:09,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:41:09,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:41:09,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 16:41:09,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:41:10,388 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:41:10,943 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:41:16,489 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:41:17,823 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:41:32,492 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 16:41:32,616 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:41:32,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:41:32,835 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:41:33,049 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:41:33,294 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:41:33,544 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:41:33,776 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:34,511 WARN L193 SmtUtils]: Spent 730.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:35,143 WARN L193 SmtUtils]: Spent 628.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 16:41:35,796 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 16:41:36,398 WARN L193 SmtUtils]: Spent 598.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:41:36,944 WARN L193 SmtUtils]: Spent 542.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:41:37,285 WARN L193 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:41:37,608 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:41:37,913 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:41:40,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [380820672] [2020-07-20 16:41:40,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:41:40,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-20 16:41:40,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301335401] [2020-07-20 16:41:40,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:41:40,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:41:40,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:41:40,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=340, Unknown=2, NotChecked=0, Total=380 [2020-07-20 16:41:40,225 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 19 states. [2020-07-20 16:41:48,549 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-20 16:41:59,897 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-20 16:42:06,919 WARN L193 SmtUtils]: Spent 621.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 28 [2020-07-20 16:42:11,318 WARN L193 SmtUtils]: Spent 836.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 26 [2020-07-20 16:42:14,278 WARN L193 SmtUtils]: Spent 791.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 27 [2020-07-20 16:42:19,092 WARN L193 SmtUtils]: Spent 758.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-20 16:42:24,718 WARN L193 SmtUtils]: Spent 789.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-20 16:42:28,230 WARN L193 SmtUtils]: Spent 726.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28